精读三作业41.Hesuddenlysawawaterfall.Itwasanimpressivesight:thewaterseemed____straightoutoftheclouds.a.todropb.droppedc.tobedroppingd.tohavedropped2.Heintended____anaccuratecalculationlastweek.a.tomakeb.tobemad

　　精读三作业4

　　1.Hesuddenlysawawaterfall.Itwasanimpressivesight:thewaterseemed____straightoutoftheclouds.

　　a.todropb.droppedc.tobedroppingd.tohavedropped

　　2.Heintended____anaccuratecalculationlastweek.

　　a.tomakeb.tobemadec.tohavebeenmaded.tohavemade

　　3.Iamsorryto____thebookforsuchalongtime.

　　a.keepb.hadkeptc.havekeptd.havingkept

　　4.Theyappear____intheaccident.

　　a.wasinjuredb.tohavebeeninjuredc.toinjured.beinginjured

　　5.Sheseemed____aboutitalready.

　　a.hearb.hearingc.toheard.tohaveheard

　　6.Youseen____yourhealth.

　　a.torecoverb.toberecoveringc.haverecoveredd.recovered

　　7.Thenextthing____istooilthemachine.

　　a.tobedoneb.tobedoingc.dod.willbedone

　　8.Theoldmanissaid____averypoormanwhenhewasyoung.

　　a.tobeb.hewasc.tohavebeendhavingbeen

　　9.Thegasseems____veryquickly.

　　a.havingexpandedb.tohavebeenexpanding

　　c.tohaveexpandedd.toexpand

　　10.Theresearchwasknown____forover20years.

　　a.tobegoingonb.tohavebeengoingonc.tohavegoneond.togoon

　　11.Theywereglad____somethingforthepeople.

　　a.tohavedoneb.tohavedoingc.tobedoned.tohavebeendone

　　12.Heasked____re-electedsincehehadbeenchairmanforsevenyears.

　　a.nottohavebeenb.nottobec.tobenotd.tohavenotbeen

　　13.Thesatelliteisalwaysescapingfromtheearth____backbygravitythesamedistanceithasescaped.

　　a.topullb.tohavebeenpulledc.onlytobepulledd.onlybeingpulled

　　14.Muchresearchinthisfieldremains____.

　　a.todob.doingc.tobedoned.tohavebeendone

　　15.Inorder____intospace,agreatforceisneededtoovercometheforceofgravity.

　　a.asatellitetolaunchb.forasatellitetobelaunched

　　c.forsatellitetobelaunchingd.toasatelliteislaunched

　　16.Thechildpretended____whathispatentsweresaying.

　　a.tobenotlisteningtob.tobelisteningnotto

　　c.tonotbelisteningtod.nottobelisteningto

　　17.Thefirstaeroplaneissaid____